x=10
y=20
z=x+y
print(z)

a=3.14
b=2.718
c=a*b
print(a)

name = "dongzesheng"
name_list = list(name)
fist_char = name_list[0]
sub_char = name_list[1:5]
upper_name = name.upper()
print(fist_char)
print(sub_char)
print(upper_name)

numbers = []
for i in range(1,11):
    numbers.append(i)

numbers_4_3 = numbers
numbers_4_3[4] = 100

colors = ("", "", "")
colors = list(colors)
colors.append("Yellow")
colors[1] = "Blue"
colors = tuple(colors)
print(colors)

person = {
    "name":"dongzeseng", 
    "age":""
    }
person.update({"home_town":"wuhan"})
person["age"] = 35
print(person)
del person["home_town"]



